The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 17, 2007
Filed:
Mar. 07, 2002
Noriyoshi Kuroyanagi, Higashiyamato, JP;
Naoki Suehiro, Tsukuba-shi, Ibaraki, JP;
Satoru Ozawa, Hino, JP;
Mitsuhiro Tomita, Machida, JP;
Kohei Otake, Suginami-ku, JP;
Masakazu Takahashi, Kouza-gun, JP;
Noriyoshi Kuroyanagi, Higashiyamato, JP;
Naoki Suehiro, Tsukuba-shi, Ibaraki, JP;
Satoru Ozawa, Hino, JP;
Mitsuhiro Tomita, Machida, JP;
Kohei Otake, Suginami-ku, JP;
Masakazu Takahashi, Kouza-gun, JP;
Other;
Tama-Tlo Ltd., Tokyo, JP;
Abstract
This invention provides techniques for a CDMA system having high spectrum efficiency with low transmit power. Each transmitter comprises means of selecting some core-sequences out of multiple sequences to make them convey plural data, means of producing an enveloped selected sequence with such a method as to arrange as guard sequences to a repeated sequence made by repeating each of the selected core-sequences, means of modulating a user specific orthogonal carrier frequency by the enveloped selected sequence to produce a transmit-symbol, and means of transmitting the transmit-symbols. And a receiver comprises means of demodulating a receive-symbol with one of the user specific carrier frequencies to produce a base-band receive-symbol, means of separating respective components corresponding to the sequences selected by the user, by analyzing the base-band receive-symbol with a matrix composed of a channel response vector from the user to the receiver to detect plural data on the components.